Date: Fri, 14 May 1999 09:02:00 +0930 From: Greg Lehey <grog@lemis.com> To: Andrew Doran <ad@fionn.sports.gov.uk> Cc: Chuck Youse <cyouse@cybersites.com>, freebsd-hackers@FreeBSD.ORG Subject: DPT performance (was: fsck and large file system) Message-ID: <19990514090159.A89091@freebie.lemis.com> In-Reply-To: <373A952C.4AFAA37C@fionn.sports.gov.uk>; from Andrew Doran on Thu, May 13, 1999 at 10:02:36AM %2B0100 References: <Pine.LNX.4.10.9905121956501.8130-100000@ns1.cybersites.com> <373A952C.4AFAA37C@fionn.sports.gov.uk>
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On Thursday, 13 May 1999 at 10:02:36 +0100, Andrew Doran wrote: > Chuck Youse wrote: > >> Whoa ... can anyone substantiate that this poor performance is typical >> or atypical of DPT SCSI RAID controllers? > > This is atypical, What's typical? Have you (or anybody else) done any measurements? I'd be very interested to see other results. > however DPT HBAs are *very* touchy about termination and > cabling. For instance, with two identical (old) Seagate Hawks on a > SmartCache III, I get 2MB/s reads from one and 500kB/s from the > other. Have you analysed the reasons for this discrepancy? If you can't get rid of the problem, it's not exactly an advertisement for DPT. Greg -- See complete headers for address, home page and phone numbers finger grog@lemis.com for PGP public key To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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